SB20260816416 - Use-after-free in Linux kernel task BPF storage handling in copy_process() and free_task()

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72110)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a use-after-free in task BPF storage handling in copy_process() and free_task() when handling a fork operation that aborts before task BPF storage is initialized. A local user can trigger a failed fork from a process inserted into a task storage map to cause a denial of service or execute arbitrary code.

Exploitation is reachable when the calling process has been inserted into a task storage map.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/43f0005f81b8ce3be962d653cde8db9022f1e9b0
• https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed
• https://git.kernel.org/stable/c/9cff220ddb65b022cc668bb652200742476e744c
• https://git.kernel.org/stable/c/c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74
• https://git.kernel.org/stable/c/c4f626ddf2350652ad2f79daf1f10847f3f6eabd